大型地下洞室位移量级预测初步探讨  

PRELIMINARY INVESTIGATION ON DISPLACEMENT PREDICTION OF LARGE UNDERGROUND CAVERNS

作　　者：陈菲[1,2] 邓建辉[3,4] 何川[1,2] 魏进兵[3,4] 高春玉[3,4] 

机构地区：[1]西南交通大学交通隧道工程教育部重点实验室,四川成都610031 [2]西南交通大学土木工程学院,四川成都610031 [3]四川大学水力学与山区河流开发保护国家重点实验室,四川成都610065 [4]四川大学水利水电学院,四川成都610065

出　　处：《岩石力学与工程学报》2013年第4期747-753,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家重点基础研究发展计划(973)项目(2010CB732005;2010CB732105;2011CB201201)

摘　　要：位移是岩体最容易测量与控制的参数,其量级与速率是隧道工程围岩稳定评判或位移监控的基本参数。但对于大型地下洞室而言,目前尚未建立相应的标准。以我国西南地区已建或开挖完毕的6个水电站大型地下厂房的位移监测成果为基础,总结影响地下厂房围岩位移量级的因素,提炼出主要影响因素,即围岩初始地应力水平和岩体性状,分别用最大主应力max与岩块饱和单轴抗压强度c表征。引入围岩应力强度比代表2个主要因素,建立其与边墙最大和平均位移量级的2个经验关系式,取得了较好的研究结果,该成果可为地下洞室位移监测设计、预警与监控标准的建立提供参考。最后,对经验公式的适用性与改进途径进行分析。For rock masses,displacement is a parameter that can be easily measured and controlled;and its magnitude and rate are the basic parameters for evaluating the stability of rock masses or for displacement control in tunnels.However,such a standard is still not established for large underground caverns.Based on the measured displacements of 6 large underground powerhouse caverns in Southwest China,factors that affect the displacement development in rock masses are summarized;and major factors,i.e.in-situ stress and rock mass quality are refined,which are then represented by the maximum in-situ stress and the saturated uniaxial compressive strength.The ratio of to,i.e.is then introduced to describe the above two factors;and two empirical relations are established by regression method to describe its relation with the maximum and average displacements of the cavern sidewalls.The empirical relations give a good fitting result and can be used as reference for the monitoring design and precaution of displacement,and for the establishment of displacement control standard in large underground caverns.Possible improvements to the above empirical relations are finally analyzed.

关 键 词：岩石力学 大型地下洞室 位移量级 位移预警 监控标准 

分 类 号：TU45[建筑科学—岩土工程]